| LCLehigh Cement CO - Mason City Facility | Mason City | IA | Nonmetallic Mineral Product Manufacturing327310 | — | ◇ UNVERIFIED |
| MRMinnesota Rubber & Plastics | Mason City | IA | Plastics and Rubber Products Manufacturing326291 | — | ◇ UNVERIFIED |
| AMAlter Metal Recycling - Mason City Facility | Mason City | IA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| CRCroell Redi-mix INC | Mason City | IA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CDCurries Division of Aadg, INC - 9th Street | Mason City | IA | Fabricated Metal Product Manufacturing332321 | — | ◇ UNVERIFIED |
| MCMasonite Corporation | Mason City | IA | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| MCMasonite Corporation | Mason City | IA | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| PFPippert Farms | Mason City | IA | Food Manufacturing311919 | — | ◇ UNVERIFIED |
| WIWellborn Industries | Mason City | IA | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| AAAeron Advanced Manufacturing, L.l.c. | Mason City | IA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| AIAadg, INC. | Mason City | IA | Fabricated Metal Product Manufacturing332321 | — | ◇ UNVERIFIED |
| AAAssa Abloy Door Group LLC | Mason City | IA | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| CCCemstone Concrete Materials | Mason City | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| DIDarling Ingredients INC | Mason City | IL | Food Manufacturing311111 | — | ◇ UNVERIFIED |
| DIDarling Ingredients INC. | Mason City | IL | Food Manufacturing311613 | — | ◇ UNVERIFIED |
| GMGraham Machining Corporation | Mason City | IA | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| HGHorizon Genetics LLC | Mason City | IL | Food Manufacturing311119 | — | ◇ UNVERIFIED |
| JJJ & J Machining Welding & Fabrication | Mason City | IA | Fabricated Metal Product Manufacturing332313 | — | ◇ UNVERIFIED |
| MCMason City Recycling Center, LTD | Mason City | IA | Paper Manufacturing322299 | — | ◇ UNVERIFIED |
| PDPawsome Doggo LLC | Mason City | IA | Food Manufacturing311111 | — | ◇ UNVERIFIED |
| TDTonka Division of Shannon Group | Mason City | IA | Machinery Manufacturing333415 | — | ◇ UNVERIFIED |
| VPVcna Prairie LLC Mason City Windfarm Portable | Mason City | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
